OBD-II trouble code
P0986: Shift Solenoid "E" Control Circuit High
The last solenoid in a block is the one most likely not to be fitted to your vehicle at all — and an open circuit is the one fault mode that recent repair work can create by itself. Both of those questions come before any testing.
Quick facts
- System
- Powertrain
- Category
- Transmission / Shift Control
- Severity
- High severity
- Drivable
- Usually safe to drive short-term
- Repair cost range
- $130 – $2,200
- DIY difficulty
- Advanced DIY
One of 43 shift solenoid codes
P0986 sits in a grid: one axis is which solenoid the letter refers to, the other is what went wrong with it. Each cell is a genuinely different fault with its own diagnosis — but codes from the same row or column often appear together, and what a pairing means is usually the fastest way in. The hub page lays out all 43 and explains how to read them against each other.
See all shift solenoid codes →Browse every code in P0900–P0999, or start from the full code library.
What does P0986 mean?
P0986 means the module saw the fifth shift solenoid's control circuit sitting at a high voltage when its own output should have pulled that circuit down to ground. Electrically that is the signature of an open: a broken wire, a terminal that has backed out of a connector, an open solenoid winding, or a connection that is no longer making contact.
Before any of that gets tested, two questions specific to this code are worth answering, and they are the reason this page opens differently from the rest of its family.
The first is whether shift solenoid "E" exists on this vehicle. This is the fifth and last position in the block, and the last letter is by a wide margin the one most likely to be a slot the standard defines but the transmission does not populate. Modules are frequently shared across a range of transmissions, and a module carrying software for the version with five solenoids can be fitted to a car with four. When that happens, the missing solenoid's circuit is genuinely open, permanently, and the code is completely accurate about the electrical condition while being completely misleading about what needs fixing. Confirming the solenoid count for this specific transmission — from the vehicle's own service data, not a generic table — is a five-minute check that can save an afternoon of chasing a wire to a connector that has nothing on the other end.
The second is what work has recently been done to this transmission. Of all the fault modes in this family, an open circuit is the only one that a repair can create outright. A short develops through wear over months; an open frequently appears the moment a bolt is tightened. A terminal disturbed while a neighbouring solenoid was being changed, a connector pushed together but never latched, an internal harness routed slightly wrong and pinched under the valve body on reassembly, a case connector seal caught and not seated — all of those are open circuits that did not exist before the pan came off. If this code appeared within a few hundred miles of a solenoid replacement, a valve body job, a fluid service or a transmission removal, the previous work is the primary suspect and should be inspected before anything is bought.
When neither of those explains it, the testing is ordinary and mercifully cheap. With the ignition off, measure the resistance across the solenoid's pins at the transmission case connector. A reading in the expected range for the part means the solenoid and the internal wiring are intact and the open is between the case connector and the module. Infinite resistance means the open is inside the transmission. That single measurement splits the job in two, and it is worth taking before a part is ordered rather than after.
On a transmission with five shift solenoids the missing ratio will typically be a very tall overdrive, which is why the complaint on this code often has nothing to do with town driving. The car pulls away, changes up through the range and behaves normally around a city. It is on a long motorway run, a laden climb, or with a trailer that the driver notices the engine holding several hundred revolutions higher than it used to and the fuel consumption going with it.
Common causes
- Shift solenoid "E" not fitted to this transmission variant while the module's software expects it
- Terminal disturbed or backed out during a previous solenoid or valve body repair
- Connector pushed together but never fully latched after work on the transmission
- Internal harness pinched or trapped during reassembly of the valve body
- Open solenoid winding, usually from age and heat cycling rather than sudden failure
- Broken control wire between the transmission case connector and the control module
- Corroded terminal in the case connector no longer making contact
- Case connector seal displaced during reinstallation, allowing fluid onto the pins
- Failed module output driver stuck in the open state
Symptoms
- Loss of the tallest ratio, most noticeable at sustained motorway speed
- Engine holding several hundred revolutions higher than normal at cruise
- Fuel consumption noticeably worse on long journeys but normal around town
- Transmission behaving correctly at low speed and in traffic
- Fault appearing shortly after a solenoid, valve body or fluid repair
- Transmission entering a failsafe strategy with a reduced set of ratios
- Check engine light on with a gear ratio code stored alongside
- No slipping or harshness, just a ratio that is no longer selected
Diagnostic steps
- 1.Confirm from the vehicle's own service data how many shift solenoids this specific transmission has, because a module shared across variants can report a permanently open circuit for a solenoid that was never fitted.
- 2.Ask what work has been done to this transmission recently, since an open circuit is the one fault mode a repair can create the day it is carried out.
- 3.If there has been recent work, inspect that connector and harness routing first — a latch not engaged and a harness trapped under the valve body both look exactly like this code.
- 4.With the ignition off, measure resistance across the solenoid pins at the transmission case connector to split an internal open from an external one.
- 5.Measure continuity from the case connector back to the module pin to confirm the harness between them is intact.
- 6.Inspect the case connector terminals for a pin pushed back into the housing, which makes contact intermittently and reads open when it matters.
- 7.Compare the command state and the reported circuit state in live data while the module cycles the output, rather than relying on the stored code alone.
- 8.Road test at sustained motorway speed rather than around town, because the missing ratio on this position is a tall overdrive that a city drive will never call for.
- 9.Confirm the module has power and grounds within specification before condemning an output driver.
Repair cost
$130 – $2,200
Diagnosis is $130 to $260. Where a recent repair caused it, correcting a connector or harness routing may be a workshop hour and little else — reseating a latch is not a parts job. An external wiring or connector repair runs $150 to $450. A solenoid replaced from below with the pan off is $350 to $900 including fluid and filter on most transmissions. Where the solenoids are only available inside a sealed assembly the figure rises to $900 to $2,200 fitted. If the outcome is that the transmission never had a fifth solenoid, the fix is module configuration rather than hardware, typically $120 to $300 at a shop with the correct programming access.
Estimate your repair
Run the numbers for your vehicle
Open the Repair Cost Estimator with transmission shift solenoid replacement preselected. Adjust labor rate and vehicle category to fit your situation.
DIY vs shop
This is an advanced DIY job. It typically requires specialty tools, scan-tool access, lifting equipment, or careful sequencing to avoid causing new failures. Plan for extended downtime and have a backup vehicle. Most owners are better served by a shop that has done this repair before.